Ota master, system, method, non-transitory storage medium, and vehicle

ABSTRACT

An OTA master controls a software update for an electronic control unit mounted on a vehicle. The OTA master includes a processor configured to individually receive, from a center, a distribution package of update data for an electronic control unit on which a first-type non-volatile memory having one storage area is mounted and a distribution package of update data for an electronic control unit on which a second-type non-volatile memory having two storage areas is mounted, and transfer the update data to an electronic control unit to be updated with prioritizing the update data for the electronic control unit on which the second-type non-volatile memory is mounted over the update data for the electronic control unit on which the first-type non-volatile memory is mounted.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Japanese Patent Application No. 2021-095738 filed on Jun. 8, 2021, incorporated herein by reference in its entirety.

BACKGROUND 1. Technical Field

The present disclosure relates to an OTA master, a system, a method, a non-transitory storage medium, and a vehicle that control a software update for an electronic control unit.

2. Description of Related Art

A plurality of electronic control units used for controlling an operation of a vehicle is mounted on a vehicle. The electronic control unit includes a processor, a transitory storage unit, such as a random access memory (RAM), and a non-volatile memory which is a non-volatile storage unit, such as a flash read-only memory (ROM). A control function of the electronic control unit is implemented when the processor executes software stored in the non-volatile memory. Software stored in each electronic control unit is rewritable, and by updating to a newer version of the software, it is possible to improve a function of each electronic control unit or add a new vehicle control function.

As a technology for updating software of an electronic control unit, an over-the-air (OTA) technology is well-known. In the OTA technology, a device that wirelessly connects an in-vehicle communication device connected to an in-vehicle network to a communication network, such as the Internet, and executes software update processing of the vehicle updates or adds the software of the electronic control unit by downloading software from a server via wireless communication and installing the downloaded software on the electronic control unit (see, for example, Japanese Unexamined Patent Application Publication No. 2004-326689).

As types of non-volatile memories mounted on the electronic control unit, there are a memory (a single bank memory) that has one storage area used for storing data, such as software, and a memory (a dual bank memory) that has two storage areas used for storing data, such as software. The non-volatile memories may be properly used according to specifications or the like of the electronic control unit. An electronic control unit having the dual bank memory mounted thereon can store two versions of data, old and new, in the two storage areas, respectively.

SUMMARY

In a campaign, which is an event for updating software for vehicles, there is a case where both an electronic control unit having a single bank memory mounted thereon and an electronic control unit having a dual bank memory mounted thereon are electronic control units of which software is to be updated. Due to structures of the memories, the electronic control unit having the single bank memory mounted thereon and the electronic control unit having the dual bank memory mounted thereon have different recovery methods when the update fails.

For this reason, when applying, to a vehicle, a campaign in which the electronic control unit having the single bank memory mounted thereon and the electronic control unit having the dual bank memory mounted thereon are mixed as the electronic control units of which software is to be updated, in a case where download and installation are not executed according to the structures of the memories mounted on the electronic control units of which the software is to be updated, it may take time to normally start the electronic control units after the software update.

The present disclosure provides an OTA master, a system, a method, a non-transitory storage medium, and a vehicle that can execute a software update adapted to a single bank memory and a dual bank memory.

A first aspect of the present disclosure is an OTA master that controls a software update for an electronic control unit mounted on a vehicle. The OTA master includes a processor configured to individually receive, from a center, a distribution package of update data for an electronic control unit on which a first-type non-volatile memory having one storage area is mounted and a distribution package of update data for an electronic control unit on which a second-type non-volatile memory having two storage areas is mounted, and transfer the update data to an electronic control unit to be updated with prioritizing the update data for the electronic control unit on which the second-type non-volatile memory is mounted over the update data for the electronic control unit on which the first-type non-volatile memory is mounted.

In the first aspect, the processor may acquire, from the center, type information indicating whether the non-volatile memory on which the electronic control unit is mounted is the first type or the second type.

In the first aspect, the OTA master may further include a storage device configured to store the type information.

In the first aspect, the processor may transfer, based on the type information, the received update data to the electronic control unit to be updated.

A system according to a second aspect of the present disclosure includes an OTA master that controls a software update for an electronic control unit mounted on a vehicle and a center configured to communicate with the OTA master. The center is configured to transmit, to the OTA master, a distribution package of update data for an electronic control unit on which a first-type non-volatile memory having one storage area is mounted and a distribution package of update data for an electronic control unit on which a second-type non-volatile memory having two storage areas is mounted. The OTA master includes a processor configured to individually receive, from the center, a distribution package of update data for an electronic control unit on which a first-type non-volatile memory is mounted and a distribution package of update data for an electronic control unit on which a second-type non-volatile memory is mounted, and transfer, to an electronic control unit to be updated, the update data received in the distribution package with prioritizing the update data for the electronic control unit on which the second-type non-volatile memory is mounted over the update data for the electronic control unit on which the first-type non-volatile memory is mounted.

In the second aspect, at least one of the center and the OTA master may include a storage device configured to store type information indicating whether the non-volatile memory on which the electronic control unit is mounted is the first type or the second type.

A third aspect of the present disclosure is a method executed by an OTA master that includes a processor and a memory and that controls a software update for an electronic control unit mounted on a vehicle. The method includes individually receiving, from the center, a distribution package of update data for an electronic control unit on which a first-type non-volatile memory having one storage area is mounted and a distribution package of update data for an electronic control unit on which a second-type non-volatile memory having two storage areas is mounted, and transferring the update data to an electronic control unit to be updated with prioritizing the update data for the electronic control unit on which the second-type non-volatile memory is mounted over the update data for the electronic control unit on which the first-type non-volatile memory is mounted.

A fourth aspect of the present disclosure is a non-transitory storage medium storing a command that can be executed by a processor of an OTA master which includes the processor and a memory and that controls a software update for an electronic control unit mounted on a vehicle and that causes the processor to perform functions. The functions include individually receiving, from a center, a distribution package of update data for the electronic control unit on which a first-type non-volatile memory having one storage area is mounted and a distribution package of update data for the electronic control unit on which a second-type non-volatile memory having two storage areas is mounted, and transferring the update data to the electronic control unit to be updated with prioritizing the update data for the electronic control unit on which the second-type non-volatile memory is mounted over the update data for the electronic control unit on which the first-type non-volatile memory is mounted.

A fifth aspect of the present disclosure is a vehicle on which the OTA master is mounted.

With each aspect of the present disclosure, it is possible to provide an OTA master, a system, a method, a non-transitory storage medium, and a vehicle that can execute a software update (download, installation) adapted to a single bank memory and a dual bank memory.

BRIEF DESCRIPTION OF THE DRAWINGS

Features, advantages, and technical and industrial significance of exemplary embodiments of the present disclosure will be described below with reference to the accompanying drawings, in which like signs denote like elements, and wherein:

FIG. 1 is a block diagram illustrating an overall configuration of a network system according to an embodiment;

FIG. 2 is a block diagram illustrating a schematic configuration of a center;

FIG. 3 is a functional block diagram of the center;

FIG. 4 is a block diagram illustrating a schematic configuration of an OTA master;

FIG. 5 is a functional block diagram of the OTA master;

FIG. 6A is a block diagram illustrating an example of a schematic configuration of an electronic control unit;

FIG. 6B is a block diagram illustrating another example of the schematic configuration of the electronic control unit;

FIG. 7 is a diagram illustrating an example of type information;

FIG. 8 is an example of a flowchart of download processing procedures executed by the center and the OTA master;

FIG. 9 is an example of a flowchart of installation processing procedures executed by the OTA master and a target electronic control unit; and

FIG. 10 is an example of a flowchart of activation processing procedures executed by the OTA master and the target electronic control unit.

DETAILED DESCRIPTION OF EMBODIMENTS

In a network system of the present disclosure, an OTA master receives, from a center, update data for an electronic control unit (ECU) having a single bank memory mounted thereon and update data for an ECU having a dual bank memory mounted thereon in individual distribution packages, and executes installation with prioritizing the installation of the update data on the ECU having the dual bank memory mounted thereon over the installation of the update data on the ECU having the single bank memory mounted thereon. As such, it is possible to execute a software update adapted to the single bank memory and the dual bank memory. Hereinafter, one embodiment of the present disclosure will be described in detail with reference to drawings.

EMBODIMENTS

Configuration

FIG. 1 is a block diagram illustrating an overall configuration of a network system according to one embodiment of the present disclosure. The network system illustrated in FIG. 1 is used for updating software of a plurality of ECUs 40 a to 40 d mounted on a vehicle, and includes a center 10 outside the vehicle and an in-vehicle network 20 constructed inside the vehicle.

(1) Center

The center 10 can communicate with an OTA master 30 (described below) included in the in-vehicle network 20, via a network 70. The center 10 can control and manage the software update for the ECUs 40 a to 40 d connected to the OTA master 30 by transmitting the update data of the software of the ECUs 40 a to 40 d, receiving a notification indicating a proceeding situation of software update processing, or the like, to and from the OTA master 30. The center 10 functions as a so-called server.

FIG. 2 is a block diagram illustrating a schematic configuration of the center 10 in FIG. 1 . As illustrated in FIG. 2 , the center 10 includes a central processing unit (CPU) 11, a RAM 12, a storage device 13, and a communication device 14. The storage device 13 includes a readable and writable storage medium, such as a hard disk drive (HDD) or a solid state drive (SSD), and stores a program used for executing software update management, information used for software update control and the software update management, update data of the software of each ECU, and the like. At the center 10, the CPU 11 executes predetermined processing for the software update by executing a program read from the storage device 13 using the RAM 12 as a work area. The communication device 14 is used for communicating with the OTA master 30 via the network 70 illustrated in FIG. 1 .

FIG. 3 is a functional block diagram of the center 10 illustrated in FIG. 2 . The center 10 exemplified in FIG. 3 includes a storage unit 16, a communication unit 17, and a control unit 18. A function of the storage unit 16 is implemented by the storage device 13 illustrated in FIG. 2 . Functions of the communication unit 17 and the control unit 18 are implemented when the CPU 11 illustrated in FIG. 2 executes a program stored in the storage device 13 using the RAM 12.

The storage unit 16 stores information on the software update processing of one or more ECUs mounted on the vehicle. As the information on the software update processing, the storage unit 16 at least stores update management information in which information indicating software that can be used in the ECUs 40 a to 40 d is associated with each piece of vehicle identification information (a vehicle ID) for identifying a vehicle, and the update data of the software of the ECUs 40 a to 40 d. As the information indicating the software that can be used in the ECUs 40 a to 40 d, for example, a combination of latest version information of each piece of the software of the ECUs 40 a to 40 d is defined. Further, as the information on the software update processing, the storage unit 16 can store an update status indicating an update state of the software executed in the vehicle. In addition, the storage unit 16 can store information (described below) on types of the non-volatile memories mounted on the ECUs 40 a to 40 d, respectively.

The communication unit 17 functions as a transmission unit and receiving unit that transmits and receives data, information, requests, and the like, to and from the OTA master 30. The communication unit 17 receives an update confirmation request of the software from the OTA master 30 (the receiving unit). The update confirmation request may be, for example, information transmitted from the OTA master 30 to the center 10 at a time when a power supply or an ignition is turned on (hereinafter, referred to as “power supply ON”) in the vehicle, and is information for requesting the center 10 to confirm whether there is the update data for the ECUs 40 a to 40 d based on vehicle configuration information described below. Further, the communication unit 17 transmits information indicating whether there is the update data to the OTA master 30 in response to the update confirmation request received from the OTA master 30 (the transmission unit). Further, the communication unit 17 receives a transmission request (a download request) for the distribution package from the OTA master 30 (the receiving unit). Further, upon receiving the download request for the distribution package, the communication unit 17 transmits, to the OTA master 30, the distribution package of the update data of the software of the ECUs 40 a to 40 d generated by the control unit 18 described below (the transmission unit).

When the communication unit 17 receives the update confirmation request from the OTA master 30, the control unit 18 determines, based on the update management information stored in the storage unit 16, whether there is the update data of the software of the ECUs 40 a to 40 d mounted on the vehicle specified by the vehicle ID, which is included in the update confirmation request. The determination result, by the control unit 18, of whether there is the update data is transmitted to the OTA master 30 by the communication unit 17. Upon determining that there is the update data of the software of the ECUs 40 a to 40 d and receiving the download request for the distribution package from the OTA master 30, the control unit 18 generates the distribution package of the update data stored in the storage unit 16.

The control unit 18 individually generates a distribution package including only the update data for the ECU having the single bank memory (described below) mounted thereon and a distribution package including only the update data for the ECU having the dual bank memory (described below) mounted thereon. When type information described below is stored in the storage unit 16 in advance, the control unit 18 can intentionally and individually generate distribution packages of pieces of update data which are different depending on types. By individually generating the distribution packages of the update data based on such types, it is possible to individually transmit, from (the communication unit 17 of) the center 10 to the OTA master 30, the distribution package of the update data for the ECU having the first-type non-volatile memory mounted thereon and the distribution package of the update data for the ECU having the second-type non-volatile memory mounted thereon.

(2) In-Vehicle Network

The in-vehicle network 20 includes the OTA master 30, the ECUs 40 a to 40 d, and a communication module 50. The OTA master 30 is connected to the communication module 50 via a bus 60 a, connected to the ECUs 40 a, 40 b via a bus 60 b, and connected to the ECUs 40 c, 40 d via a bus 60 c.

The OTA master 30 can wirelessly communicate with the center 10 via the bus 60 a and the communication module 50 by way of the network 70. The OTA master 30 has functions of managing an OTA state and executing the software update for an ECU of which software is to be updated (hereinafter also referred to as a “target ECU”) by controlling an update sequence, which is a flow of the software update processing. Based on the update data and the like acquired from the center 10, the OTA master 30 controls the software update for the target ECU from among the ECUs 40 a to 40 d. The OTA master 30 may also be referred to as a central gateway (CGW).

FIG. 4 is a block diagram illustrating a schematic configuration of the OTA master 30 in FIG. 1 . As exemplified in FIG. 4 , the OTA master 30 includes a CPU 31, a RAM 32, a ROM 33, a storage device 34, and a communication device 36. The CPU 31, the RAM 32, the ROM 33, and the storage device 34 compose a microcomputer 35. In the OTA master 30, the CPU 31 executes predetermined processing for the software update by executing a program read from the ROM 33 using the RAM 32 as a work area. The communication device 36 is used for communicating with each of the communication module 50 and the ECUs 40 a to 40 d via the buses 60 a to 60 c illustrated in FIG. 1 .

FIG. 5 is a functional block diagram of the OTA master 30 illustrated in FIG. 4 . The OTA master 30 exemplified in FIG. 5 includes a storage unit 37, a communication unit 38, and a control unit 39. A function of the storage unit 37 is implemented by the storage device 34 illustrated in FIG. 4 . Functions of the communication unit 38 and the control unit 39 are implemented when the CPU 31 illustrated in FIG. 4 executes a program stored in the ROM 33 using the RAM 32.

In addition to a program (a control program of the OTA master 30) for updating the software of the ECUs 40 a to 40 d or various pieces of data used when updating the software, the storage unit 37 stores the update data of the software and the like that are downloaded from the center 10. Further, the storage unit 37 can store the information (described below) on the types of the non-volatile memories mounted on the ECUs 40 a to 40 d, respectively.

The communication unit 38 functions as a transmission unit and receiving unit that transmits and receives data, information, requests, and the like to and from the center 10. The communication unit 38 transmits the update confirmation request of the software to the center 10 at, for example, the time of power supply ON of the vehicle (the transmission unit). The update confirmation request includes, for example, a vehicle ID for identifying the vehicle and the information on the current versions of the software of the ECUs 40 a to 40 d connected to the in-vehicle network 20. The vehicle ID and the current versions of the software of the ECUs 40 a to 40 d are used for determining whether there is the update data of the software of the ECUs 40 a to 40 d by comparing them with the latest software version held by the center 10 for each vehicle ID. Further, as a response to the update confirmation request, the communication unit 38 receives a notification indicating whether there is the update data from the center 10 (the receiving unit). When there is the update data of the software of the ECUs 40 a to 40 d, the communication unit 38 transmits, to the center 10, a download request for the distribution package of the update data of the software (the transmission unit), and receives (downloads) the distribution package transmitted from the center 10 (the receiving unit). Further, the communication unit 38 transmits, to the center 10, the update state of the software transmitted by the ECUs 40 a to 40 d (the transmission unit).

The control unit 39 determines whether there is the update data of the software of the ECUs 40 a to 40 d based on the response to the update confirmation request received from the center 10 by the communication unit 38. Further, the control unit 39 verifies authenticity of the distribution package received (downloaded) from the center 10 by the communication unit 38 and stored in the storage unit 37. Further, the control unit 39 controls the software update processing (various types of verification, the installation, the activation, and the like) for the ECUs 40 a to 40 d using the update data received (downloaded) from the center 10. Specifically, the control unit 39 transfers one or more pieces of update data downloaded in the distribution package to the target ECU and causes the target ECU to install the update software based on the update data. After the completion of the installation, the control unit 39 gives the target ECU an instruction on activation for validating the installed update software. At the time of executing the software update processing, the control unit 39 suitably controls procedures of the various types of verification, the installation, the activation, and the like on the ECUs 40 a to 40 d.

The ECUs 40 a to 40 d are devices used for controlling an operation of each part of the vehicle. FIG. 1 illustrates an example where the in-vehicle network 20 includes four ECUs 40 a to 40 d, but the number of ECUs is not particularly limited. For example, the OTA master 30 may be connected to a display device (an HMI) used for executing various displays, such as a display representing that there is update data at the time of executing the software update processing of the ECUs 40 a to 40 d, a display of an approval request screen for requesting approval for the software update from a user or a manager of the vehicle, and a display of a result of the software update. As the display device, for example, a car navigation system can be used. Further, the number of buses that connect the ECUs to the OTA master 30 is not particularly limited, either. For example, the above-described display device may be connected to the OTA master 30 via a bus other than the buses 60 a to 60 c.

Each of FIGS. 6A and 6B illustrates one example of a schematic configuration of the ECUs 40 a to 40 d.

The ECU 40 a illustrated in FIG. 6A includes a CPU 41, a RAM 42, a non-volatile memory 43 a, and a communication device 44. The CPU 41 implements a function of the ECU 40 a by executing the program read from the non-volatile memory 43 a using the RAM 42 as a work area. The non-volatile memory 43 a is a memory (hereinafter, referred to as a single bank memory) having one storage area 45 used for storing data, such as software. Hereinafter, a memory type of the non-volatile memory 43 a configured to have the one storage area 45 is referred to as a “first type”. In the storage area 45, in addition to the software used for implementing the function of the ECU 40 a, version information, parameter data, a boot program for booting, a program for updating software, or the like may be stored. The communication device 44 is used for communicating with the OTA master 30 or other ECUs 40 b to 40 d connected to the in-vehicle network 20.

Similar to the ECU 40 a, the ECU 40 b illustrated in FIG. 6B includes the CPU 41, the RAM 42, a non-volatile memory 43 b, and the communication device 44. However, the non-volatile memory 43 b mounted on the ECU 40 b is a memory (hereinafter, referred to as a dual bank memory) having two storage areas 46 a, 46 b used for storing data, such as software. Hereinafter, a memory type of the non-volatile memory 43 b configured to have the two storage areas 46 a, 46 b is referred to as a “second type”. In the storage areas 46 a, 46 b, in addition to the software used for implementing the function of the ECU 40 b, version information, parameter data, a boot program for booting, a program for updating software, or the like, may be stored. The CPU 41 of the ECU 40 b uses any one of the two storage areas 46 a, 46 b included in the non-volatile memory 43 b as the storage area (an operational side) to be read, and executes software stored in the storage area to be read. On the other storage area (a non-operational side) that is not to be read, the update software (an updated version program) can be installed (written) based on the update data on the background while the program in the storage area (the operational side) to be read is being executed. In the software update processing, at the time of executing the activation (validating the update software), the update software can be activated by switching the storage area from which the program is read by the CPU 41 of the ECU 40 b.

As a specific example, it is assumed that current software is stored in the storage area 46 a of the non-volatile memory 43 b, which is the dual bank memory, and the update software is installed on the storage area 46 b. For example, upon receiving an instruction on activating the update software from the OTA master 30, the ECU 40 b can switch the storage area (the operational side) to be read of the CPU 41 by switching a read start address of the CPU 41 from a head address of the storage area 46 a to a head address of the storage area 46 b, and can execute the update software installed on the storage area 46 b. In the present disclosure, a configuration referred to as a “one-sided suspension memory” in which one storage area is pseudo-divided into two sides and a program can be written on the one side while the program stored on the other side is being executed is also classified into the second-type memory.

FIG. 7 illustrates an example of the type information on the type of the non-volatile memory mounted on each of the ECUs 40 a to 40 d. In the type information exemplified in FIG. 7 , an ECU_ID, which is a number used for identifying the ECU, is associated with the type (the first type (the single bank)/the second type (the dual bank)) of the non-volatile memory mounted on the ECU. The type information is stored and managed in one or both of the storage unit 37 of the OTA master 30 and the storage unit 16 of the center 10. The type information may be created in advance based on specifications of the ECUs 40 a to 40 d composing the in-vehicle network 20 and stored in the storage unit 37 of the OTA master 30 at the time of manufacturing and the like of the vehicle. Alternatively, the type information may be acquired by the OTA master 30 from the target ECU by communication inside the in-vehicle network 20 at the time of executing the software update processing. When the type of non-volatile memory is acquired from the target ECU each time the software update processing is executed, the OTA master 30 can unitarily manage the types of non-volatile memories mounted on the ECUs mounted on the vehicle and appropriately respond even when the type of non-volatile memory is changed due to replacement of the ECU and the like. Alternatively, when the type information is managed by the center 10, the OTA master 30 may acquire the type information from the center 10 via the network 70.

The communication module 50 is a unit having a function of controlling communication between the center 10 and the vehicle, and is a communication device used for connecting the in-vehicle network 20 to the center 10. The communication module 50 is wirelessly connected to the center 10 by way of the network 70, and the OTA master 30 executes authentication of the vehicle, the download of the update data, or the like. The communication module 50 may be included in the OTA master 30.

Overview of Software Update Processing

At, for example, the time of the power supply ON in the vehicle, the OTA master 30 transmits the update confirmation request of the software to the center 10. The update confirmation request includes a vehicle ID used for identifying the vehicle and vehicle configuration information, which is information on a state of an ECU (a system configuration), such as current versions of hardware and the software of the ECUs 40 a to 40 d connected to the in-vehicle network 20. The vehicle configuration information can be created by acquiring identification numbers (ECU_ID) of the ECUs and identification numbers of the software versions (ECU_Software_ID) of the ECUs from the ECUs 40 a to 40 d connected to the in-vehicle network 20. The vehicle ID and the current versions of the software of the ECUs 40 a to 40 d are used for determining whether there is the update data of the software of the ECUs 40 a to 40 d by comparing them with the latest software version held by the center 10 for each vehicle ID. As a response to the update confirmation request received from the OTA master 30, the center 10 transmits a notification indicating whether there is the update data to the OTA master 30. When there is the update data of the software of the ECUs 40 a to 40 d, the OTA master 30 transmits, to the center 10, the download request for the distribution package. In response to the download request received from the OTA master 30, the center 10 transmits, to the OTA master 30, the distribution package of the update data. In addition to the update data, the distribution package may include verification data for verifying the authenticity of the update data, the number of pieces of update data, type information, various pieces of control information used at the time of the software update, or the like.

The OTA master 30 determines whether there is the update data of the software of the ECUs 40 a to 40 d based on the response to the update confirmation request received from the center 10. Further, the OTA master 30 verifies the authenticity of the distribution package received from the center 10 and stored in the storage device 13. Further, the OTA master 30 transfers one or more pieces of update data downloaded in the distribution package to the target ECU and causes the target ECU to install the update data. After the completion of the installation, the OTA master 30 gives the target ECU an instruction on activation for validating the installed updated version software.

Further, in approval request processing, the OTA master 30 causes an output device to output a notification indicating that the approval for the software update is required or a notification prompting an input indicating that the software update has been approved. As the output device, a display device (not shown), provided on the in-vehicle network 20 and outputting a notification by a display, a voice output device (not shown) that outputs a notification by voice, or the like, can be used. For example, in the approval request processing, when the display device is used as the output device, the OTA master 30 can cause the display device to display an approval request screen used for requesting the approval for the software update from the user or the manager, or cause the display device to display a notification prompting a specific input operation, such as pressing of an approval button in the case where the user or the manager approves the request. Alternatively, in the approval request processing, the OTA master 30 can cause the display device to display text, an icon, or the like, notifying that there is the update data of the software of the ECUs 40 a to 40 d, or cause the display device to display restrictions and the like during the execution of the software update processing. Upon receiving the input indicating that the request has been approved from the user or the manager, the OTA master 30 executes control processing of the above-described installation and activation, and updates the software of the target ECU.

Here, when the non-volatile memory of the target ECU is the single bank memory, in principle, approval request processing for the software update is executed before the execution of the installation because the installation and the activation are consecutively executed. Even for the target ECU of the single bank memory, it can be required that the update processing is temporarily stopped, that is, the activation may be on stand-by (suspended) when the installation is in a completed state. Further, when the non-volatile memory of the target ECU is the dual bank memory, the approval request processing for the software update is executed at least after the execution of the installation and before the execution of the activation. When the non-volatile memory of the target ECU is the dual bank memory, the approval request processing for the software update may be executed before the execution of the installation or omitted.

The software update processing is composed of a phase in which the OTA master 30 downloads (receives) the update data from the center 10 (a download phase), a phase in which the OTA master 30 transfers the downloaded update data to the target ECU and installs (writes) the update software based on the update data in the storage area of the target ECU (an installation phase), and a phase in which the target ECU activates (make active) the installed update software (an activation phase).

The download is processing in which the OTA master 30 receives, from the center 10, the update data for updating the software of the ECU transmitted in the distribution package and stores it in the storage unit 37. In the download, the reception of the update data for the ECU having the dual bank memory mounted thereon and the reception of the update data for the ECU having the single bank memory mounted thereon are individually executed. The download phase includes not only the execution of the download, but also controls of a series of processes associated with the download, such as determining whether the download can be executed and verifying the update data.

The update data transmitted from the center 10 to the OTA master 30 may include any of the update software of the ECU (total data or difference data), the compressed data obtained by compressing the update software, and the divided data obtained by dividing the update software or the compressed data. Further, the update data may include the ECU_ID of the target ECU (or the serial number) and an ECU_Software_ID of the target ECU before the update. The update data is downloaded as the above-described distribution package, but the distribution package includes the update data for a single ECU or update data for a plurality of ECUs which have the same memory type.

The installation is processing in which the OTA master 30 writes, according to a determined procedure, the update software (the updated version program) on the non-volatile memory 43 a and/or the non-volatile memory 43 b of a plurality of target ECUs, based on the update data downloaded from the center 10. The installation is executed with prioritizing the update data for the ECU having the dual bank memory mounted thereon, which has a relatively low probability of update failure, over the update data for the ECU having the single bank memory mounted thereon, which has a relatively high probability of update failure. The installation phase includes not only the execution of the installation, but also controls of a series of processes associated with the installation, such as determining whether the installation can be executed, transferring the update data, and verifying the update software.

When the update data includes the update software itself (the total data), in the installation phase, the OTA master 30 transfers the update data (the update software) to the target ECU. Further, when the update data includes the compressed data of the update software, difference data, or divided data, the OTA master 30 may transfer the update data to the target ECU and the target ECU may generate the update software from the update data, or the OTA master 30 may generate the update software from the update data and then transfer the update software to the target ECU. Here, the update software can be generated by decompressing the compressed data or assembling (integrating) the difference data or the divided data.

The update software can be installed by the target ECU based on a request for the installation from the OTA master 30. A specific target ECU that has received the update data may autonomously execute the installation without receiving an explicit instruction from the OTA master 30.

The activation is processing in which the target ECU makes active the update software installed on the non-volatile memory 43 a and/or the non-volatile memory 43 b. The activation may be executed with prioritizing any one of the update data for the ECU having the dual bank memory mounted thereon and the update data for the ECU having the single bank memory mounted thereon, or may be executed without prioritizing any of them. The activation phase includes not only the execution of the activation but also controls of a series of processes associated with the activation, such as determining whether the activation can be executed, the approval request for the activation to the user or the manager of the vehicle, and verifying the execution result.

The update software can be activated by the target ECU based on a request for the activation from the OTA master 30. A specific target ECU that has received the update data may autonomously execute the activation after the completion of the installation without receiving an explicit instruction from the OTA master 30.

The software update processing can be executed continuously or in parallel to each of the target ECUs.

Further, the “software update processing” in the present specification includes not only processing for continuously executing all of the download, installation, and activation, but also processing for executing only a part of the download, installation, and activation.

Processing

Next, specific examples of the software update processing executed in the network system according to the present embodiment will be described with further reference to FIGS. 8, 9, and 10 .

(1) Specific Example of Download

FIG. 8 is a flowchart describing download processing procedures according to a specific example executed by the center 10 and the OTA master 30. The download processing exemplified in FIG. 8 is started when the center 10 receives the download request for the distribution package from the OTA master 30.

(Step S801) The center 10 generates the distribution package of the update data for the first-type target ECU from among the target ECUs of which the software is to be updated. Further, the center 10 generates the distribution package of the update data for the second-type target ECU from among the target ECUs of which the software is to be updated. At this time, the center 10 can refer to the type information stored in the storage unit 16 and determine the memory type of the non-volatile memory mounted on the target ECU. When the center 10 manages the types of non-volatile memories mounted on the ECUs 40 a to 40 d, respectively, information on the memory types may be included in the distribution packages. When the distribution package of the update data for the first-type target ECU and the distribution package of the update data for the second-type target ECU are generated, respectively, the process proceeds to step S802.

(Step S802) The center 10 transmits, to the OTA master 30, the distribution package of the update data for the first-type target ECU and the distribution package of the update data for the second-type target ECU, respectively. In other words, the center 10 separately transmits, to the OTA master 30, the distribution package of the update data for the first-type target ECU and the distribution package of the update data for the second-type target ECU. When each distribution package is transmitted, the process proceeds to step S803.

(Step S803) The OTA master 30 receives the distribution package of the update data for the first-type target ECU and the distribution package of the update data for the second-type target ECU, respectively, which are separately transmitted from the center 10. When the reception of each distribution package is completed, the process proceeds to step S804.

(Step S804) The OTA master 30 stores, in the storage unit 37, the update data (and the information on the memory type and the like) received in the respective distribution packages from the center 10. As such, the download processing ends.

With the specific example of the download, the OTA master 30 can individually receive, from the center 10, the distribution package of the update data for the first-type target ECU and the distribution package of the update data for the second-type target ECU. By this processing, when the download of any of the update data fails, only the distribution package of the update data that has failed needs to be downloaded again, and thus it is possible to complete the software update at an early stage.

(2) Specific Example of Installation

FIG. 9 is a flowchart describing installation processing procedures according to a specific example executed by the OTA master 30 and the target ECU. The specific example of the installation exemplified in FIG. 9 is started after the download of the update data for at least one target ECU is completed and when predetermined conditions (the installation can be executed, OK in verification of the update data, and the like) are satisfied.

(Step S901) The OTA master 30 acquires the type (the first type/the second type) of the non-volatile memory mounted on the target ECU. This memory type can be acquired by referring to the type information (FIG. 7 ) stored in the storage unit 37 when the OTA master 30 manages the memory type, and by referring to the information of the memory type that is included in the distribution package and transmitted when the center 10 manages the memory type. When the memory type of the target ECU is acquired, the process proceeds to step S902.

(Step S902) The OTA master 30 and the second-type target ECU start the installation, which is processing for writing the update software on the storage area of the non-volatile memory of the second-type target ECU, based on the update data. When the update data includes the update software itself, the installation is executed when the update data is transferred from the OTA master 30 to the second-type target ECU. The installation is started all at once or in a predetermined order on every second-type target ECU. When the installation on the second-type target ECU is started, the process proceeds to step S903.

(Step S903) The OTA master 30 and the first-type target ECU start the installation, which is processing for writing the update software on the storage area of the non-volatile memory of the first-type target ECU, based on the update data. When the update data includes the update software itself, the installation is executed when the update data is transferred from the OTA master 30 to the first-type target ECU. The installation is started all at once or in a predetermined order on every first-type target ECU. The installation on the first-type target ECU may be started after the installation on every second-type target ECU is completed or after the installation on some second-type target ECUs, determined in advance, is completed. When the installation on the first-type target ECU is started, the process proceeds to step S904.

(Step S904) The OTA master 30 determines whether the installation of the update software on every (the first-type and the second-type) target ECU is completed. The OTA master 30 may determine the completion of the installation based on a completion notification from each target ECU or after a predetermined time has elapsed from the start of the installation. The predetermined time can be set, for example, to be equal to or longer than a maximum time needed for each installation. When it is determined that the installation of the update software on all of the target ECUs are completed (step S904, YES), the installation on the target ECUs is completed and this installation processing ends.

With the specific example of the installation, it is possible to start the installation with prioritizing the installation on the second-type target ECU, which does not require a stop control during the update, over the installation on the first-type target ECU, which requires the stop control during the update. By this processing, it is possible to reduce the communication load inside the vehicle (the in-vehicle network 20) and shorten a time during which the control of the vehicle should be stopped until the installation (writing) of all the update software is completed.

(3) Specific Example of Activation

FIG. 10 is a flowchart describing activation processing procedures according to a specific example of executed by the OTA master 30 and the target ECU. The activation processing exemplified in FIG. 10 is started after the installation on the first-type target ECU and the installation on the second-type target ECU are completed, respectively, and when predetermined conditions (the activation can be executed, OK in the verification of the update data, and the like) are satisfied.

(Step S1001) The OTA master 30 and the first-type target ECU start the activation, which is processing for validating the update software written on the storage area of the non-volatile memory of the first-type target ECU. The activation is started all at once or in a predetermined order on every first-type target ECU. When the activation of the update software on the first-type target ECU is started, the process proceeds to step S1002.

(Step S1002) The OTA master 30 and the second-type target ECU start the activation, which is processing for validating the update software written on the storage area of the non-volatile memory of the second-type target ECU. The activation is started all at once or in a predetermined order on every second-type target ECU. The activation of the update software on the second-type target ECU may be started after the activation of the supdate software on every first-type target ECU is completed or after the activation of the update software on some first-type target ECUs, determined in advance, is completed. When the activation of the update software on the second-type target ECU is started, the process proceeds to step S1003.

(Step S1003) The OTA master 30 determines whether the activation of the update software on every (the first-type and the second-type) target ECU is completed. The OTA master 30 may determine the completion of the activation based on a completion notification from each type target ECU or after a predetermined time has elapsed from the start of the activation. The predetermined time can be set, for example, to be equal to or longer than a maximum time needed for each activation. When it is determined that the activation of the update software on all of the target ECUs are completed (step S1003, YES), the activation on the target ECUs is completed and this activation processing ends.

With the specific example of the activation, the software update for the second-type target ECU can be executed after success of the software update for the first-type target ECU is confirmed, and thus it is possible to appropriately execute the software update processing of the system including the configurations of both the target ECU having the single bank memory mounted thereon and the target ECU having the dual bank memory mounted thereon. As the activation processing, it does not matter that the activation of the update software on the second-type target ECU is first started (step S1002) and then the activation of the update software on the first-type target ECU is started (step S1001).

Action and Advantageous Effect

As described above, with the network system according to the embodiment of the present disclosure, the OTA master separately receives, from the center, the distribution package of the update data for the ECU having the single bank memory (the first-type non-volatile memory) mounted thereon and the distribution package of the update data for the ECU having the dual bank memory (the second-type non-volatile memory) mounted thereon.

By this processing, when a distribution package cannot be normally transmitted/received due to a communication abnormality, only the corresponding distribution package needs to be transmitted/received again, and thus it is possible to restrict an increase in a communication amount (a communication load) between the center and the OTA master.

Further, with the network system according to the present embodiment, the OTA master executes the installation of each piece of update data that has been received in parallel from the center with prioritizing the installation of the update software on the ECU having the dual bank memory mounted thereon, which does not require the stop control during the update, over the installation of the update software on the ECU having the single bank memory mounted thereon, which requires the stop control during the update.

By this processing, it is possible to write the update software on the storage area of the target ECU having the dual bank memory mounted thereon first, and at the timing at which the writing is almost completed, start writing the update software on the storage area of the target ECU having the single bank memory mounted thereon. As such, it is possible to reduce the communication load inside the vehicle (the in-vehicle network) and shorten a time during which the control of the vehicle should be stopped until the writing of all the update software is completed.

As above, one embodiment of the present disclosure has been described, but the present disclosure can be regarded not only as an OTA master, but also as a method executed by the OTA master including a processor and a memory, a program, a computer-readable non-transitory storage medium storing the program, a center communicable with the OTA master, a system including the center and the OTA master, a vehicle including the OTA master, or the like.

It is possible to use the technology of the present disclosure in a network system used for updating software of an ECU. 

What is claimed is:
 1. An over-the-air (OTA) master that controls a software update for an electronic control unit mounted on a vehicle, the OTA master comprising: a processor configured to: individually receive, from a center, a distribution package of update data for an electronic control unit on which a first-type non-volatile memory having one storage area is mounted and a distribution package of update data for an electronic control unit on which a second-type non-volatile memory having two storage areas is mounted; and transfer the update data to an electronic control unit to be updated with prioritizing the update data for the electronic control unit on which the second-type non-volatile memory is mounted over the update data for the electronic control unit on which the first-type non-volatile memory is mounted.
 2. The OTA master according to claim 1, wherein the processor is configured to acquire, from the center, type information indicating whether the non-volatile memory on which the electronic control unit is mounted is the first type or the second type.
 3. The OTA master according to claim 2, further comprising a storage device configured to store the type information.
 4. The OTA master according to claim 2, wherein the processor is configured to transfer, based on the type information, the received update data to the electronic control unit to be updated.
 5. A system comprising: an OTA master that controls a software update for an electronic control unit mounted on a vehicle; and a center configured to communicate with the OTA master, wherein: the center is configured to transmit, to the OTA master, a distribution package of update data for an electronic control unit on which a first-type non-volatile memory having one storage area is mounted and a distribution package of update data for an electronic control unit on which a second-type non-volatile memory having two storage areas is mounted; and the OTA master includes a processor configured to: individually receive, from the center, the distribution package of the update data for the electronic control unit on which the first-type non-volatile memory is mounted and the distribution package of the update data for the electronic control unit on which the second-type non-volatile memory is mounted; and transfer, to an electronic control unit to be updated, the update data received in the distribution package with prioritizing the update data for the electronic control unit on which the second-type non-volatile memory is mounted over the update data for the electronic control unit on which the first-type non-volatile memory is mounted.
 6. The system according to claim 5, wherein at least one of the center and the OTA master includes a storage device configured to store type information indicating whether the non-volatile memory on which the electronic control unit is mounted is the first type or the second type.
 7. A method executed by an OTA master that includes a processor and a memory, and controls an electronic control unit mounted on a vehicle, the method comprising: individually receiving, from a center, a distribution package of update data for an electronic control unit on which a first-type non-volatile memory having one storage area is mounted and a distribution package of update data for an electronic control unit on which a second-type non-volatile memory having two storage areas is mounted; and transferring the update data to an electronic control unit to be updated with prioritizing the update data for the electronic control unit on which the second-type non-volatile memory is mounted over the update data for the electronic control unit on which the first-type non-volatile memory is mounted.
 8. A non-transitory storage medium storing instructions that are executable by a processor of an OTA master which includes the processor and a memory and controls a software update for an electronic control unit mounted on a vehicle, and that cause the processor to execute functions comprising: individually receiving, from a center, a distribution package of update data for the electronic control unit on which a first-type non-volatile memory having one storage area is mounted and a distribution package of update data for the electronic control unit on which a second-type non-volatile memory having two storage areas is mounted; and transferring the update data to an electronic control unit to be updated with prioritizing the update data for the electronic control unit on which the second-type non-volatile memory is mounted over the update data for the electronic control unit on which the first-type non-volatile memory is mounted.
 9. A vehicle comprising the OTA master according to claim
 1. 